Garmin GPSMAP 396 User Manual download pdf (Page 148)

140 GPSMAP 396 Owner’s Manual

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Calibrating the Water Speed

If you select Temp, Spd for the Transducer option on the Sonar

Setup tab, you also need to calibrate the water speed to ensure that

the Water Speed shown on your unit is accurate. The calibration

should take place in water having little or no current.

The unit automatically uses the GPS ground speed, if it is available,

for comparison on the calibration. If a GPS ground speed is not

available, use either your boat’s speedometer reading (not always

accurate) or a stopwatch to determine your speed over a certain

distance. To nd out your speed, divide the distance by the time.

To calibrate the water speed:

1. From the Sonar tab, Setup sub tab, use the ROCKER to

highlight Calibrate Water Speed, and press ENTER.

2. Bring the boat to a cruising speed. Both the top ground and

uncalibrated water speeds are shown at the bottom of the

calibration window. Note your top speed, then stop the boat,

and press ENTER.

Calibrating the Water Speed

3. By default, the top ground speed is automatically shown. If

a ground speed is not available, the top uncalibrated water

speed is used instead. If the new speed is correct, highlight

OK, and press ENTER.

If you want to manually enter a calibration, press ENTER

while the speed is highlighted, enter a new speed, and press

ENTER.

If the boat is not moving fast enough or the speed sensor is not

outputting a speed, “Boat Is Not Moving Fast Enough To Calibrate”

shows at the bottom of the screen. Check that the speed sensor

wheel is moving or safely increase boat speed. If there is a problem

with the speed sensor or if a speed sensor is not installed, “Water

Speed Sensor Is Not Working” appears at the bottom of the screen.

Check connections of speed sensor cables.

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Garmin GPSMAP 396 User Manual Page 148